I have a regex thats working normally (when i tried through online regex checking websitesites). This should not allow 1234.1234.1234.1234 but while I am using it in asp.net,it is allowing even those values.
Any suggestion?
var ipfilter = new RegExp("(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?$)");
.NET regex differs from JavaScript one immensely. However, in this case, it is a regular problem: the dot must be preceded with a literal backslash, or placed inside a character class. I suggest the latter as it is less error-prone, and you need to add a ^ (start of string) anchor:
var rx = "^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)[.](25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)[.](25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)[.](25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?$)";
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